The argument of SHA-512/256 makes NO SENSE. If you know about that, then just use HMAC.
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Are you recommending that people stop using hmac then?
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I would recommend they try SHA-512/256 before switching to a whole different hash family just to avoid length extension attacks.
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that sounds fair
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For the usage as a MAC, we had some numbers here comparing truncation and HMAC: https://eprint.iacr.org/2016/142.pdf (Appendix A)
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New conversation -
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More efficient at what? Context counts.
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